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DrewE

Vermont

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Posted: 10/11/20 07:17pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

DrewE wrote:


For most class C's, adding 5 psi to the rear tires over the chassis manufacturer's recommendations (i.e. the door sticker) will put the tires exactly 5 psi over their maximum inflation pressure. The rear axle weight rating is the maximum for the standard tires at their maximum pressure of 80 psi. It's fairly likely the wheels are also rated for a maximum of 80 psi.

Would 5 psi higher than the rating be dangerous in practice? Probably not...but still it's hardly a good idea.


Please show me a class C rear tire inflation of 80psi. Do you understand that will add up to at least 11,000#.

Like I said weigh your rig LOADED. Use chart, it ain’t gonna be 80psi front or rear.

I run full rear axle rating of 9,750#. Ram says 65psi rear.


Standard tires on the E450 (and, I believe, the E350) are load range E LT225/75R16 tires, which are rated for 2470 pounds each at 80 psi maximum for duallies. GAWR for the rear axle on the E450 is 9600 pounds, very close to the 9880 pound maximum possible with the tires. At any rate, 80 psi is almost always the placarded tire inflation pressure for class C motorhomes on the E450 chassis (and I believe the equivalent Chevy van chassis is similar in this regard).

The E350 chassis uses the same tire size but has a 8500 pound axle rating, so would presumably call for a somewhat lower pressure. I think the E450 is more common for class C motorhomes--and required essential for larger ones, of course.

Class C's based on the transit and sprinter chassis (and Ram ProMaster), as well as super-C's, do have different tire sizes and ratings and inflation pressures.





JIMNLIN

Oklahoma

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Posted: 10/12/20 06:40am Link  |  Quote  |  Print  |  Notify Moderator

A class C is a high body drw vehicle or truck carrying a tall heavy camper vs a drw pickup truck pulling a trailer. Having owned and used all three I've found tire pressure needs will be apples vs pickles.
Side winds will add more load on the C and truck camper on one side of the vehicle vs the other.

Those minimum pressure for the load charts are a good starting point for a car or a empty truck.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

'03 2500 QC Dodge/Cummins HO 3.73 6 speed manual Jacobs Westach
'97 Park Avanue 28' 5er 11200 two slides

Cummins12V98

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Posted: 10/12/20 11:41am Link  |  Quote  |  Print  |  Notify Moderator

E LT225/75R16

80psi

single 3,000# x = 6,000#

Dual 2,727# x 4 = 10,908#


2015 RAM LongHorn 3500 Dually CrewCab 4X4 CUMMINS/AISIN RearAir 385HP/865TQ 4:10's
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DrewE

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Posted: 10/12/20 01:51pm Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

E LT225/75R16

80psi

single 3,000# x = 6,000#

Dual 2,727# x 4 = 10,908#


What is the source for those numbers? They appear to me to be for load range F at 95 psi, rather than load range E at 80 psi.

The LT225/75R16 load range E tires I have on my class C are embossed with a max load rating of 2680 lbs single at 80 psi (i.e. 5320 lbs per axle), or 2470 lbs dual at 80 psi (9880 lbs per axle). I'm sitting here with my laptop reading it off said tire directly. This agrees with all the data I can find online for this size and load range of tire.

Cummins12V98

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Posted: 10/12/20 02:23pm Link  |  Quote  |  Print  |  Notify Moderator

DrewE wrote:

Cummins12V98 wrote:

E LT225/75R16

80psi

single 3,000# x = 6,000#

Dual 2,727# x 4 = 10,908#


What is the source for those numbers? They appear to me to be for load range F at 95 psi, rather than load range E at 80 psi.

The LT225/75R16 load range E tires I have on my class C are embossed with a max load rating of 2680 lbs single at 80 psi (i.e. 5320 lbs per axle), or 2470 lbs dual at 80 psi (9880 lbs per axle). I'm sitting here with my laptop reading it off said tire directly. This agrees with all the data I can find online for this size and load range of tire.


Those arte some small tires. Yes I did not notice the "F"

Geeze

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Posted: 10/15/20 08:49pm Link  |  Quote  |  Print  |  Notify Moderator

dave17352 wrote:

Just ready to head out in our new to use rig. Its a 2016 260ds Leprechaun. I was checking tire pressure and airing up. Door panel says 65 front 80 rears. I am probably about 13k and the rig has a max of about 14.5. I have not weighed her yet but I have 3k ccc. We are loaded lite. I know things add up quickly as I have had many rigs.


Back to the original question. Assuming I am running well under max what do you folks with a 27 foot class c run your pressures at.

Thanks
Dave
We have a Leprechaun 319MB I run 70 front, 80 rear and 70 in the airbags.

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